Help! Pigeons!

[flyingwithtwins]

I am having problems keeping the pigeons (and other birds) out of my hangar. I have tried the fake owls, fake snakes, even flashing lights. I have had two national pest-control companies give offers for "new" methods. I have called Bird-X and they are sending literature for their Sonic Blaster PRO and some other systems.

Does anyone have FIRST HAND knowledge of these systems? If you do, what has been your experience(s)?

This is also something that I am researching for the industrial setting where I work. Same problem, bigger budget.